06/04/2012, 02:50. Mariela Assmann

CASTLE – “The Limey” – A devilishly handsome detective from Scotland Yard, Simon Hunt (Brett Tucker, “Off the Map,” “Spartacus,” guest stars), teams up with Castle & Beckett to find the person responsible for the murder of his friend’s daughter. Also, Charles Shaughnessy (“Days of Our Lives”) plays Nigel Winthrop, the Deputy General at the British Consulate whom Castle & Beckett suspect is up to more than just ambassadorial balls and diplomatic luncheons. Meanwhile, Lanie convinces Beckett that she needs to make a move on Castle before it is too late, on “Castle,” MONDAY, APRIL 2 (10:01-11:00 p.m., ET), on the ABC Television Network. (ABC/KAREN NEAL)
STANA KATIC, NATHAN FILLION