in medias res

in me·di·as res  (n md-s rs)

adv.

In or into the middle of a sequence of events, as in a literary narrative.

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[Latin in medis rs : in, into + medis : accusative pl. feminine of medius, in the middle of + rs, accusative pl. of rs, thing.]

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in medias res Latin [ɪn ˈmiːdɪˌæs ˈreɪs]

(Literary & Literary Critical Terms) in or into the middle of events or a narrative

[literally: into the midst of things, taken from a passage in Horace's Ars Poetica]