Feenx: What work did the shop do on the car a couple weeks ago?
About the only thing that JL can do wrong is not put enough oil in the car or leave something loose so the oil leaks out. Do you have an oil pressure gauge in the car, and did you happen to notice what it read? Did you see any idiot lights on before she blew?
What were the driving conditions when this happened? High rev during acceleration from stop?
The best case against JL would be if there was evidence that the engine ran dry. Then you could claim that they didn't put in (enough) oil. All the better if there is evidence that the drain plug was loose/damaged, or the oil filter wasn't fully attached and was leaking.
In the absence of that, it would depend on what work the shop did, to see if they did something wrong. Any warranty from the shop?
EDIT: Just read the previous post.
The "clicking sound" was possibly a broken ring moving around. A broken ring can catch on the cylinder wall and throw the rod in a variety of stunning directions.
Keep us posted...